Re: 26. NEWBEES, if possible avoid wireless alarm systems

["Craig B" <twl3001@xxxxxxxxxxx>]

Just an FYI, most wireless systems, if they are to meet UL requirements for
resi or commercial burg (and fire too for that matter), are REQUIRED to send
a supervisory report at least every hour which includes bits that tell the
panel the batteries are low.  UL requires that this signal is sent
consistently every hour thereafter, and the battery must last for two weeks
after the initial low battery signal.

As for interference, most panels if they are worth their salt include some
sort of option which provides a time window after which, if the
above-mentioned supervision signals are not received from EVERY sensor, the
panel will notify the user and/or the central station.  Thus, it looks like
somehow your system may have been sending the signals to the central station
but not alerting you.

Out of curiosity, which system was giving you this trouble?

Craig B.


<--> wrote in message news:uciba110rm8fs20unqhlo7uq934ploimrc@xxxxxxxxxx
>
> They are not reliable and are dead on warning when a transmitter
> operates in a condition who muzzle the wireless alarm system.
>
> This is easily done with Radio Transmitters operating:
> - ON the wireless frequency
> - Saturating the receiver
> - Intermodulation
> - Harmonics
> - Falling in the receiver bandpass
> - On the IF frequency
> - and more...
> This is what i call basically Radio Frequency Interferences (RFI) but
> in fact it covers, like you can notice above a lot more.
>
> In essence the problems is the fact that by no way two (or more)
> systems can use simultaneously the same frequency, its called
> collisions, interferences and more like you see above.
>
> The WORST is that the OWNER DON'T KNOW THAT HISS alarm system is no
> longer operational, no message (20 years records hold by so called
> experienced professionals: no RFI alarm).
>
> Use a wired systems and use WIRELESS only when impossible to wire, but
> BE AWARE that YOUR SAFETY IS HAZARDOUS (my system was dead during more
> than one year before i found out by accident and measuring the
> wireless receiver output signal content).
> Muzzling can occurs permanently or occasionally, mine was permanent.
>
> Note: So called low level mechanically (who claim them self
> professional) try to let you believe that my system was dumb and/or
> badly installed and they don't realize that it is an external
> influences that can't be avoided whatever wireless alarm system you
> have.
> Its a pure radio communication problem know by telecommunication
> specialists.
> There is a way around for $$$ investments but that is out of reach of
> a wireless alarm system.
>
> Paul
> NOTE: My system is replaced with a wired one, do the same.
>